Those of us who write and study history are accustomed to its approximations and ambiguities. This is why we do not take literally the tenth-hand reports of frightened and illiterate peasants who claim to have seen miracles or to have had encounters with messiahs and prophets and redeemers who were, like them, mere humans. And this is also why we will never submit to dictation from those who display a fanatical belief in certainty and revelation.